Please use a unique password as a spammer could hack your account if you have a common password. It has happened 5 times this year and in every situation the spammer was able to guess the members password. Thanks.

There is a thread discussing this. I've looked up some examples, and from examples we can see a trend.

Terminology: If we rank numbers from subgrades in decreasing order; and for simplicity, we use gap to mean the numerical difference between 3rd and 4th numbers in that rank. I just say 3rd and 4th below to mean 3rd and 4th numbers in that rank. Overall means the overall grade.

We know if gap is 0, the overall grade will be 4th number.

We know if gap is 0.5, the overall grade will be 3rd number=4th number + 0.5.

If 4th is edge/surface and gap is 1.0 or higher overall=4th + 1.0. (If gap is great enough, we might have overall=4th +1.5 like below), except one is not allowed to get overall 9.5 when gap is 1.0 (gap has to be at least 1.5), or to get 10 this way.

If 4th is centering and gap is 1.0 or 1.5 (less than 2.0 and greater than 0.5), overall=4th + 0.5; if gap is 2.0 or greater but less than 4.5, overall=4th + 1.0; if gap is greater than or equal to 4.5, overall=4th + 1.5.

If 4th is corner and gap is 1.0, 1.5, 2.0, or 2.5 (less than 3.0 and greater than 0.5), overall=4th+ 0.5; if the gap is greater than or equal to 3.0, overall=4th+ 1.0; etc...

In summary, corner is punshed toughest, next is centering, surface and edge the least. How far the overall grade is better than the worst subgrade depends on which subgrade is worst and also depends on how much better the rest three subgrades are.